a = int(input("请输入百分制成绩:"))
b = 0
if a >= 90:
    b = 5
elif a >= 80:
    b = 4
elif a >= 70:
    b = 3
elif a >= 60:
    b = 2
else:
    b = 1
print(a, "对应的5分制为:", b)
